Le "Peaking Effect"

Minier, C.; Lauzier, J.; Esnouf, C.; Fantozzi, Gilbert

doi:10.1051/jphyscol:1983905

Cited by 2 publications

(5 citation statements)

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“…The increase of the peak height in the samples irradiated for longer times and in samples without a cover, i.e. the increase of the peak height for a larger number of defects, could be related to a dragging process, of peaking effect type [4][5][6][7]. The peaking effect has been reported for copper.…”

Section: Discussionmentioning

confidence: 81%

“…The strong dependence on the oscillating strain and the relatively high critical values with which the new peak disappears, ε 0 = 1 × 10 −5 , could relate this peak to the stress assisted break away of dislocations from the weak pinning points. In fact, it has been reported for copper that the lowest strain at which the peaking effect appears is about 10 −6 [6,7]. Therefore ε 0 = 2 × 10 −5 could be the lowest strain which produces the minimum stress needed for the break away of dislocations.…”

Section: Discussionmentioning

confidence: 94%

“…In fact, early results for copper reported that the peaking effect appears as an amplitude independent damping phenomenon in room-temperature irradiated samples previously annealed at temperatures lower than 1023 K [10]. However, subsequent works have shown that amplitude dependent damping effects appear in the peaking effect for samples irradiated around 160 K previously annealed at 1173 K [6,7].…”

Section: Discussionmentioning

confidence: 98%

“…The pinning points follow the motion of dislocations. In this model the damping increases for a larger number of defects [4][5][6][7].…”

Section: Introductionmentioning

confidence: 93%

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Mechanical dynamical spectroscopy in low-flux neutron irradiated pure copper

Lambri

Torio

et al. 1996

J. Phys.: Condens. Matter

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The effects of low-flux neutron irradiation performed at room temperature on mechanical dynamical spectroscopy in pure copper (99.99%) are shown. A new damping peak at approximately 730 K appears in the irradiated polycrystalline samples, which is absent from the unirradiated and single-crystals one. This peak could be controlled by a cooperative mechanism between grain boundary sliding, the dragging of point defects which follow the dislocation line and the stress assisted break away of dislocations from the pinning points which were generated by the irradiation process.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 98%

“…The pinning points follow the motion of dislocations. In this model the damping increases for a larger number of defects [4][5][6][7].…”

Section: Introductionmentioning

confidence: 93%

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Mechanical dynamical spectroscopy in low-flux neutron irradiated pure copper

Lambri

Torio

et al. 1996

J. Phys.: Condens. Matter

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“…La relaxation des atomes d'hydrogène conduit à une contribution continûment décroissante avec le temps de vieillissement après chargement. La contribution d'origine magnéto-mécanique passe, elle, par un maximum pour un temps de vieillissement de 48 h à 300 K. Pour interpréter ce dernier phénomène, il est possible de faire l'analogie avec le « peaking effect » observé dans les solides cristallins [21 ] et qui est le résultat de l'évolution de la concentration d'agents piégeants interstitiels sur la mobilité des dislocations après irradiation. Dans notre cas, l'agent piégeant se trouve être l'hydrogène et les parois de domaines ferromagnétiques sont les entités mobiles.…”

Section: Discussionunclassified

Comportement micromécanique d'un verre métallique Fe-B-Si-C chargé en hydrogène

Allemand

Fouquet

Pérez

1986

Rev. Phys. Appl. (Paris)

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2014 Les verres métalliques ferromagnétiques et magnétostrictifs soumis à une contrainte cyclique sont le siège d'un effet magnétoélastique, ou effet 0394E. En frottement intérieur, cet effet se caractérise par un amortissement d'ordre magnétomécanique. Ce comportement micromécanique a été suivi dans le cas d'un verre métallique base fer (Fe83B14Si1,5C1,5) en relation avec l'état structural du matériau. Par ailleurs, le chargement en hydrogène par voie électrolytique sur un tel matériau entraîne la mise en évidence d'un pic de frottement intérieur dont l'origine physique ne peut être uniquement liée au seul phénomène relaxationnel connu sous le nom de pic de Snoek. Il ressort de cette étude l'existence d'une interaction importante entre les parois de domaines ferromagnétiques et les atomes d'hydrogène ainsi que d'une redistribution ou réorientation des atomes d'hydrogène sous l'effet d'un champ magnétique, liée à la nature magnétostrictive du matériau. Abstract. 2014 When a cyclic stress is applied, ferromagnetic and magnetostrictive metallic glasses exhibit a magnetoelastic effect or 0394E-effect. Such an effect is associated to a magnetomechanical damping. This micromechanical behaviour has been studied in the case of an iron-based amorphous alloy (Fe83B14Si1.5C1.5), as a function of the structural state of the material. On the other hand, after electrolytically introducing hydrogen, an internal friction peak is observed. The physical processus leading to such a peak cannot only be attributed to the relaxational phenomenon well known as Snoek peak. A strong interaction between ferromagnetic domain walls and hydrogen atoms and a redistribution or a reorientation of hydrogen atoms under magnetic field, due to the magnetostrictive property of the material, are suggested in order to explain all the expérimental features.

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Le "Peaking Effect"

Abstract: -Les caractéristiques expérimentales du "Peaking Effect" sont passées en revue et les différents modèles théoriques d'interprétation sont analysés.

Cited by 2 publications

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Mechanical dynamical spectroscopy in low-flux neutron irradiated pure copper

Mechanical dynamical spectroscopy in low-flux neutron irradiated pure copper

Comportement micromécanique d'un verre métallique Fe-B-Si-C chargé en hydrogène

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